Related Experiment Videos
[Study on the quantum yields of triplet state formation]
1State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Academia Sinica,100080 Beijing.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|February 1, 1997
Summary
Researchers measured triplet state formation quantum yields for acridine, benzophenone, phenothiazine, and phenanthrene using pulsed laser photoacoustic calorimetry. Results deviated from literature due to transducer response, but deconvolution improved accuracy.
Area of Science:
- Photochemistry
- Spectroscopy
- Chemical Kinetics
Context:
- Accurate measurement of triplet state formation quantum yields (φT) is crucial in photochemistry.
- Pulsed laser photoacoustic calorimetry offers a sensitive method for these measurements.
- Previous studies have reported φT values for various aromatic compounds.
Purpose:
- To measure the triplet state formation quantum yields (φT) of acridine, benzophenone, phenothiazine, and phenanthrene.
- To evaluate the suitability of pulsed laser photoacoustic calorimetry for these measurements.
- To identify and address limitations in the measurement technique.
Summary:
- Triplet state formation quantum yields (φT) were determined using pulsed laser photoacoustic calorimetry with anthracene as a calibrant.
- Measured φT values for benzophenone, phenothiazine, and phenanthrene differed from literature data.
- Discrepancies were attributed to the slow response of the PZT transducer, affecting measurement accuracy.
- Applying a deconvolution method successfully corrected for the transducer's response, yielding improved results.
Impact:
- Highlights the importance of accounting for instrumental response in photoacoustic calorimetry.
- Provides a method to improve the accuracy of quantum yield measurements.
- Offers reliable φT data for acridine, benzophenone, phenothiazine, and phenanthrene.
- Enhances understanding of intersystem crossing efficiencies in aromatic molecules.